Full-scale production of VFAs from sewage sludge by anaerobic alkaline fermentation to improve biological nutrients removal in domestic wastewater
[Display omitted] •A full-scale project was operated for sludge fermentation to produce VFAs.•Sludge reduce, carbon recovery and nutrient removal were simultaneously improved.•A very high solid content of 7% was adopted in sludge fermentation.•VFAs from sludge meets requirement for upgrading nutrien...
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Veröffentlicht in: | Bioresource technology 2018-07, Vol.260, p.105-114 |
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Sprache: | eng |
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•A full-scale project was operated for sludge fermentation to produce VFAs.•Sludge reduce, carbon recovery and nutrient removal were simultaneously improved.•A very high solid content of 7% was adopted in sludge fermentation.•VFAs from sludge meets requirement for upgrading nutrient removal of wastewater.•This project presents greater economic advantage than biogas production process.
A full-scale project of thermal-alkaline pretreatment and alkaline fermentation of sewage sludge was built to produce volatile fatty acids (VFAs) which was then used as external carbon source for improving biological nitrogen and phosphorus removals (BNPR) in wastewater plant. Results showed this project had efficient and stable performances in VFA production, sludge reduce and BNPR. Hydrolysis rate in pretreatment, VFAs yield in fermentation and total VS reduction reached 68.7%, 261.32 mg COD/g VSS and 54.19%, respectively. Moreover, fermentation liquid with VFA presented similar efficiency as acetic acid in enhancing BNPR, obtaining removal efficiencies of nitrogen and phosphorus up to 72.39% and 89.65%, respectively. Finally, the project also presented greater economic advantage than traditional processes, and the net profits for VFAs and biogas productions are 9.12 and 3.71 USD/m3 sludge, respectively. Long-term operation indicated that anaerobic alkaline fermentation for VFAs production is technically and economically feasible for sludge carbon recovery. |
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ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2018.03.105 |